Next time someone says the 4 seed is a huge advantage over the 5 seed, I will point to this draw. Fritz doesn't really deserve to still be in the tournament. He played 5 sets in both of his first 2 matches. If Fritz got the Draper draw, there's no way that he would have defeated Cilic with the way he played against Diallo.
Anyone top player would have made the QF with Fritz's draw. I'm pretty sure Draper beats Diallo, and quite easily. If Draper can't beat Diallo in a slam tournament, then he isn't worthy of a Top 5 ranking.
That said, they should make the draw standard ranking, instead of random. 1 plays 8, 2 plays 7, 3 plays 6, and 4 plays 5 in the QF. There's no reason why a 5-seed should have a way more cakewalk draw than the 4-seed. Also remember, Fritz backed into the 5 seed by losing in the first round of Queens, while Draper earned the 4 seed by making the semis.